To improve dashboard performance, Power BI developers should reduce the number of visuals on each page and limit the complexity of DAX queries. Use Performance Analyzer to identify slow components and optimize visuals or queries causing delays. Optimize data models by using star schema, minimize the number of columns and tables, and remove unused fields. Preload data using import mode for faster refresh rates. Limit real-time data queries unless essential and schedule appropriate refresh intervals. Ensuring that the visual load is minimized and data models are optimized will result in faster and more responsive dashboards.